<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数参数</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon>
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                        expand-trigger="hover"
                        :options="cateList"
                        v-model="selectedCateKeys"
                        :props="cateProps"
                        change-on-select
                        @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">动态参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index, scope.row)">
                                    {{item}}
                                </el-tag>
                            <!-- 输入的文本框 -->
                            <el-input 
                                class="input-new-tag" 
                                v-if="scope.row.inputVisible" 
                                v-model="scope.row.inputValue" 
                                ref="saveTagInput" 
                                size="small"
                                @keyup.enter.native="handleInputConfirm"
                                @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column prop="attr_name" label="参数名称" width="180"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">静态属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index, scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input 
                                    class="input-new-tag" 
                                    v-if="scope.row.inputVisible" 
                                    v-model="scope.row.inputValue" 
                                    ref="saveTagInput" 
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column prop="attr_name" label="参数名称" width="180"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>

export default {
    name: 'Params',
    data() {
        return {
            // 商品分类列表
            cateList: [],
            // 级联选择框的配置对象
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys: [],
            // 被激活的页签的名称
            activeName: 'many',
            // 动态参数的数据
            manyTableData: [],
            // 静态属性的数据
            onlyTableData: [],
            // 控制添加对话框的显示与隐藏
            addDialogVisible: false,
            addForm: {
                attr_name: ''
            },
            addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ],
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible: false,
            editForm: {
                attr_name: ''
            },
            editFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ],
            },
            // // 控制按钮与文本框的切换显示
            // inputVisible: false,
            // // 文本框的输入内容
            // inputValue: '',
        };
    },
    computed: {
        // 如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3) {
                return true;
            }else {
                return false;
            }
        },
        // 当前选中的三级分类的Id
        cateId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2];
            }else {
                return null;
            }
        },
        // 动态计算标题的文本
        titleText() {
            if(this.activeName === 'many') {
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有的商品分类列表
        async getCateList() {
            const { data: res } = await this.$http.get('categories')
            // console.log(res);
            if(res.meta.status === 200) {
                this.cateList = res.data
            } else {
                return this.$message.error('获取商品分类失败！')
            }
        },
        handleChange() {
            // 获取参数列表数据
            this.getParamsData()
        },
        async getParamsData() {
            // console.log(this.selectedCateKeys);
            if(this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return 
            }

            // 证明选中的是三级分类
            // console.log(this.selectedCateKeys);
            // 根据所选分类的id，和当前所处的面板，获取对应的参数
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                params: {
                    sel: this.activeName
                }
            })
            // console.log(res);
            if(res.meta.status === 200) {
                console.log(res.data);
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                    // 控制文本框的显示与隐藏
                    item.inputVisible = false
                    // 文本框中输入的值
                    item.inputValue = ''
                })

                if(this.activeName === 'many') {
                    this.manyTableData = res.data
                }else {
                    this.onlyTableData = res.data
                }
            }else {
                return this.$message.error('获取参数列表失败！')
            }
        },
        // Tab页签点击事件的处理函数
        handleTabClick() {
            // console.log(this.activeName);
            this.getParamsData()
        },
        // 监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮，添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if(valid) {
                    // console.log(valid);
                    const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                        attr_name: this.addForm.attr_name,
                        attr_sel: this.activeName
                    })
                    // console.log(res);
                    if(res.meta.status === 201) {
                        this.$message.success('添加参数成功！')
                        this.addDialogVisible = false;
                        this.getParamsData()
                    }else {
                        this.$message.error('添加参数失败！')
                    }
                }else {
                    return 
                }
            })
        },
        // 重置修改的表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，展示修改的对话框
        async showEditDialog(attr_id) {
            console.log(attr_id);
            // 查询当前参数的信息
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
                params: { attr_sel: this.activeName }
            })
            console.log(res);
            if(res.meta.status === 200) {
                this.editForm = res.data;
                this.editDialogVisible = true;
            }
        },
        // 修改参数对话框并提交
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if(valid) {
                    console.log(valid);
                    const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                        attr_name: this.editForm.attr_name,
                        attr_sel: this.activeName
                    })
                    console.log(res);
                    if(res.meta.status === 200) {
                        this.getParamsData()
                        this.$message.success('修改参数成功！')
                        this.editDialogVisible = false;
                    }else{
                        return this.$message.error('修改参数失败！')
                    }
                }else {
                    return
                }
            })
        },
        // 根据id删除对应的参数项
        async removeParams(attr_id) {
            // 弹窗询问用户是否删除
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch (err => err)
            
            // 如果用户确认删除，则返回值为字符串 confirm
            // 如果用户取消了删除，则返回值为字符串 cancel
            console.log(confirmResult);
            if(confirmResult === 'confirm') {
                const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
                console.log(res);
                if(res.meta.status === 200) {
                    this.$message.success('删除参数成功！')
                    // 刷新数据列表
                    this.getParamsData()
                }else {
                    return this.$message.error('删除参数失败！')
                }
            }else {
                return this.$message.info('已取消删除')
            }
        },
        // 文本框失去焦点或摁下了enter都会触发
        handleInputConfirm(row) {
            // console.log('ok');
            // console.log(row.inputValue);
            if (row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return 
            }
            // 如果没有return，则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim());
            row.inputVisible = false;
            row.inputValue = '';
            // 需要发起请求，保存这次操作
            this.saveAttrVals(row)
        },
        // 将对attr_vals的操作，保存到数据库
        async saveAttrVals(row) {
            console.log(row);
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            console.log(res);
            if(res.meta.status === 200 ) {
                return this.$message.success('修改参数项成功！')
            }else {
                return this.$message.error('修改参数项失败！')
            }
        },
        // 点击按钮，展示文本输入框
        showInput(row) {
            row.inputVisible = true;
            // 让文本框自动获取焦点
            // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 关闭tag标签
        handleClose(index, row) {
            console.log(index, row);
            console.log(row.attr_vals[index]);
            row.attr_vals.splice(index, 1);
            this.saveAttrVals(row)
            // this.dynamicTags.splice(this.dynamicTags.indexOf(tag), 1);
        },
    },
};

</script>


<style lang="less" scoped>
.cat_opt{
    margin-top: 10px 0;
}
.el-tag {
    margin: 0 10px;
}
.button-new-tag {
    margin-left: 10px;
    height: 32px;
    line-height: 30px;
    padding-top: 0;
    padding-bottom: 0;
}
.input-new-tag {
    width: 90px;
    margin-left: 10px;
    vertical-align: bottom;
}
</style>
